Everytime I try to log-in it keeps saying that my Username/Password is not found?! Wth!! I checked my managements account and I still have FFXIV under my services. I was just logged-in earlier, so what happened and what should I do?

Have you tried rechecking the beta client? I got kicked out to do an update that is currently uber frozen at 47.3%. It is likely that there will be many updates leading up to the full release because we are essentially letting SE do stress testing on the servers.